Synchronous belt tensioning mechanism and 3D printer

Abstract

The utility model provides a synchronous belt tensioning mechanism and a 3D printer, the synchronous belt tensioning mechanism is used for tensioning a synchronous belt on a driving wheel, the synchronous belt tensioning mechanism comprises a first tensioning assembly, the first tensioning assembly comprises a moving sleeve piece, the moving sleeve piece comprises a moving wheel and a first driving piece connected with the moving wheel, and the first driving piece is connected with the moving wheel; the synchronous belt is wound between the driving wheel and the moving wheel; the sensing piece is configured to sense the tension degree of the synchronous belt; and the main control board is used for receiving a signal of the sensing piece and controlling the first driving piece to drive the moving wheel to move relative to the driving wheel so as to adjust the tensioning degree of the synchronous belt. The tension degree of the synchronous belt is detected by arranging the sensing piece, the first driving piece drives the moving wheel to move relative to the driving wheel, the tension degree of the synchronous belt is kept within a proper range, and accurate adjustment and automatic adjustment of the tension degree of the synchronous belt are achieved.

Description

Technical Field

[0001] The present application belongs to the field of 3D printing technology, and specifically relates to a synchronous belt tensioning mechanism and a 3D printer. Background Art

[0002] A 3D printer, also known as a three-dimensional printer or a stereoscopic printer, is a rapid prototyping process equipment. A 3D printer usually includes a base, a print head for ejecting printing materials, and a forming platform for receiving printing materials. The forming platform or the print head can be connected to the base through a synchronous belt transmission mechanism, and its movement in the XY plane is achieved through a synchronous belt.

[0003] However, as the use time increases, the tension of the synchronous belt will decrease and affect the transmission effect. Therefore, it is necessary to adjust the synchronous belt from time to time to keep it in a tensioned state. Usually, it is necessary to rely on the user's experience to judge whether the tension of the synchronous belt is appropriate, and manually adjust the tension of the synchronous belt. This method is difficult for novices, and the adjustment method is not smart enough, which affects the final 3D printing effect. Therefore, how to automatically adjust the tension of the synchronous belt and adjust the tension of the synchronous belt to the appropriate range is an urgent problem to be solved. Utility Model Content

[0004] The present application provides a synchronous belt tensioning mechanism and a 3D printer to solve the problem of how to automatically adjust the tension of the synchronous belt and adjust the tension of the synchronous belt to an appropriate range.

[0005] In order to solve the above technical problems, the present application provides a synchronous belt tensioning mechanism for tensioning a synchronous belt on a driving wheel, the synchronous belt tensioning mechanism comprising a first tensioning assembly, the first tensioning assembly comprising:

[0006] A moving kit, the moving kit comprising a moving wheel and a first driving member connected to the moving wheel, the synchronous belt being wound between the driving wheel and the moving wheel;

[0007] A sensing element, wherein the sensing element is configured to sense the tension of the synchronous belt;

[0008] as well as,

[0009] A main control board receives the signal of the sensing element and controls the first driving element to drive the moving wheel to move relative to the driving wheel, so as to adjust the tension of the synchronous belt.

[0010] As a further improvement of the present application, the sensing element includes a Hall sensor and a magnetic element, and the magnetic element is configured to follow the moving wheel to move in the first direction;

[0011] The Hall sensor is used to output a corresponding pulse signal according to the intensity of the magnetic field change of the magnetic component, and transmit the pulse signal to the main control board.

[0012] As a further improvement of the present application, the main control board is used to receive the pulse signal transmitted by the Hall sensor, and determine the movement amount of the moving wheel in the first direction according to the pulse signal, so as to determine the tightness of the synchronous belt at the current moment;

[0013] The main control board is also used to control the operation of the first driving member according to the tightness of the synchronous belt at the current moment, so that the first driving member drives the moving wheel to move to a preset position along the first direction.

[0014] As a further improvement of the present application, the moving kit further includes a moving block arranged between the moving wheel and the first driving member, and the magnetic member is arranged on the moving block to follow the movement of the moving wheel relative to the driving wheel in the first direction.

[0015] As a further improvement of the present application, the moving block includes a first side wall and a second side wall that are arranged opposite to each other, and a third side wall for connecting the first side wall and the second side wall;

[0016] The moving wheel is rotatably connected between the first side wall and the second side wall, the third side wall is connected to the driving shaft of the first driving member, and the moving block is driven by the first driving member to move the moving wheel along the first direction.

[0017] As a further improvement of the present application, the synchronous belt tensioning mechanism further includes a second tensioning assembly, the second tensioning assembly includes a fastening wheel and a fastening block, the fastening wheel is rotatably connected to the fastening block, and can move in a second direction relative to the driving wheel;

[0018] The synchronous belt is wound around the fastening wheel via the driving wheel, and the fastening wheel is driven to move in the second direction by pushing the fastening block to assist in adjusting the tension of the synchronous belt.

[0019] The present application also provides a 3D printer, comprising a frame, a molding platform, a printing nozzle mounted above the molding platform, a driving component for driving the printing nozzle to move, and a synchronous belt tensioning mechanism as described in any one of the above items;

[0020] The driving assembly comprises a driving wheel, a synchronous belt is wound around the driving wheel, and the number of the synchronous belt tensioning mechanisms is greater than or equal to the number of the synchronous belts.

[0021] As a further improvement of the present application, a mounting bracket for accommodating the synchronous belt tensioning mechanism is further provided in the 3D printer;

[0022] The mounting bracket includes a first mounting portion extending along a first direction, and the first tensioning assembly is disposed in the first mounting portion.

[0023] As a further improvement of the present application, the mounting bracket further includes a second mounting portion extending along a third direction, the second mounting portion is disposed at a corner of the frame, and the second tensioning assembly is disposed in the second mounting portion.

[0024] As a further improvement of the present application, an adjustment hole is opened at the position of the second mounting portion corresponding to the fastening block, and the second mounting portion abuts against the fastening block through the adjustment hole to push the fastening wheel to move in the second direction.

[0025] Compared with the prior art, the synchronous belt tensioning mechanism and the 3D printer provided in the embodiments of the present application are used to tension the synchronous belt on the driving wheel, and a sensing member is provided to detect the tension of the synchronous belt. The first driving member drives the movable wheel to move relative to the driving wheel to adjust the tension of the synchronous belt, and the tension of the synchronous belt is maintained within an appropriate range, thereby achieving accurate and automatic adjustment of the tension of the synchronous belt, avoiding customers from frequently manually adjusting the synchronous belt and affecting the final printing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 is a structural schematic diagram of a synchronous belt tensioning mechanism provided in an embodiment of the present application;

[0028] Figure 2 It is a structural schematic diagram of a moving kit in a synchronous belt tensioning mechanism provided in an embodiment of the present application;

[0029] Figure 3 is a schematic structural diagram of a mounting bracket in a synchronous belt tensioning mechanism provided in an embodiment of the present application;

[0030] Figure 4 It is a structural schematic diagram of a moving block in a synchronous belt tensioning mechanism provided in an embodiment of the present application;

[0031] Figure 5 is a specific embodiment diagram of the synchronous belt tensioning mechanism provided in the embodiment of the present application;

[0032] Figure 6 is a schematic diagram of the structure of a 3D printer provided in an embodiment of the present application;

[0033] Figure 7 is a schematic structural diagram of a second driving member in a 3D printer provided in an embodiment of the present application;

[0034] Description of reference numerals:

[0035] 1-frame; 2-molding platform; 3-printing nozzle;

[0036] 10-first tensioning assembly; 11-moving kit; 12-moving wheel; 13-first driving member; 131-driving shaft; 14-moving block; 141-first side wall; 142-second side wall; 143-third side wall; 15-bearing; 16-sensing member; 161-Hall sensor; 162-magnetic member;

[0037] 20-second tensioning assembly; 21-fastening wheel; 22-fastening block;

[0038] 30-driving assembly; 31-driving wheel; 32-synchronous belt; 33-second driving member; 34-screw rod; 35-guide plate;

[0039] 40-mounting bracket; 41-first mounting portion; 42-second mounting portion; 421-adjusting hole; 43-connecting wheel;

[0040] 50-second driving member; 51-screw rod; 52-guide plate;

[0041] a-first direction; b-second direction; c-third direction. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0043] In the description of the present application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise clearly and specifically limited. All directional indications in the embodiments of the present application (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions.

[0044] In order to make the description of the disclosed content more detailed and complete, the following is an illustrative description of the implementation methods and specific embodiments of the present application; however, this is not the only form of implementing or using the specific embodiments of the present application. The implementation methods cover the features of multiple specific embodiments and the method steps and sequences used to construct and operate these specific embodiments. However, other specific embodiments can also be used to achieve the same or equivalent functions and step sequences.

[0045] Please refer to Figure 1-Figure 7 In order to solve the problem of how to automatically adjust the tension of the synchronous belt in the prior art and adjust the tension of the synchronous belt to an appropriate range, the embodiment of the present application provides a synchronous belt tensioning mechanism and a 3D printer for tensioning the synchronous belt 32 on the driving wheel 31. Please refer to Figure 1 , which is a structural schematic diagram of a synchronous belt tensioning mechanism provided in an embodiment of the present application. The synchronous belt tensioning mechanism provided in the present application includes a first tensioning component 10, and the first tensioning component 10 specifically includes a moving kit 11, a sensor 16 and a main control board.

[0046] In an embodiment of the present application, the above-mentioned mobile kit 11 includes a mobile wheel 12 and a first driving member 13 connected to the mobile wheel 12. In the present application, a synchronous belt 32 is wound between the driving wheel 31 and the mobile wheel 12, and a sensing member 16 is provided to sense the tension of the synchronous belt 32. The main control board receives the sensing signal sent by the above-mentioned sensing member 16, controls the first driving member 13 to drive the mobile wheel 12 to move relative to the driving wheel 31, so as to adjust the tension of the synchronous belt 32, so that the synchronous belt 32 can be automatically adjusted to a suitable tension state.

[0047] As an optional implementation, the driving wheel 31 used for winding the synchronous belt 32 can be understood as a setting form of an idler wheel. In the present application, the synchronous belt 32 used in the 3D printing process is wound by the driving wheel 31 and the moving wheel 12.

[0048] Specifically, the above-mentioned first driving member 13 can drive the movable wheel 12 to move in a first direction relative to the driving wheel 13. The present application extends the axis of the driving wheel 31 along a third direction, and rotatably installs the driving wheel 31 so that the driving wheel 31 can rotate around its own axis to cooperate with the tensioning adjustment of the synchronous belt 32.

[0049] In a specific embodiment provided in this application, please refer to Figure 2 , which is a structural schematic diagram of the moving kit 11 in the synchronous belt tensioning mechanism provided in an embodiment of the present application. It can be observed that the sensing component 16 provided in the present application includes a Hall sensor 161 and a magnetic component 162, wherein the magnetic component 162 is configured to follow the moving wheel 12 to move in the first direction.

[0050] In the embodiment of the present application, the Hall sensor 161 is used to output a corresponding pulse signal according to the intensity of the magnetic field change of the magnetic member 162, and determine the movement amount of the moving wheel 12 in the first direction according to the pulse signal to determine the tightness of the synchronous belt 32 at the current moment.

[0051] Furthermore, the above-mentioned sensing component 16 also includes a main control board. The present application connects the main control board with the first driving component 13 and the Hall sensor 161 by wire or wirelessly. Specifically, the main control board, the first driving component 13 and the Hall sensor 161 can be electrically connected by wires, or the main control board can be wirelessly connected with the first driving component 13 and the Hall sensor 161 by Bluetooth or NFC (Near Field Communication). The above connection methods are all feasible.

[0052] Specifically, the magnetic component 162 can be set in the form of a permanent magnet. In the present application, the magnetic component 162 is set on the moving block 14 of the moving kit 11, so that it can move in the first direction following the displacement of the moving wheel 12, and the Hall sensor 161 is further fixedly installed at a position relatively close to the magnetic component 162. When the moving wheel 12 is displaced in the first direction, the magnetic component 162 set thereon will also move in the first direction. Due to the existence of the Hall effect, the Hall sensor 161 can generate corresponding electrical signal changes according to the intensity of the magnetic field change of the magnetic component 162.

[0053] These changing electrical signals will be converted into digital pulse signals by the Hall sensor 161, and the pulse signals will be sent to the main control board for signal processing. When the main control board detects a change in the electrical signal through the Hall sensor 161, it indicates that the tightness of the synchronous belt 32 has changed, and the tightness of the synchronous belt 32 needs to be adaptively adjusted through the synchronous belt tensioning mechanism.

[0054] As an optional implementation, since the main control board can calculate the displacement of the moving wheel 12 in the first direction based on the digital pulse signal sent by the Hall sensor 161, it can drive the first driving member 13 to drive the moving wheel 12 to move the same displacement in the opposite direction, thereby moving the moving wheel 12 to a preset position, so that the synchronous belt 32 is in a suitable tensioning state, thereby preventing the synchronous belt 32 from being too loose and affecting the 3D printing effect.

[0055] As for how the main control board calculates the displacement of the moving wheel 12 in the first direction according to the pulse signal, it is an existing technology widely used by the Hall sensor 161 in the field of mileage calculation, and this application will not go into details here.

[0056] Of course, the tensioning state of the synchronous belt 32 can also be preset within a preset displacement range. The displacement generated within the preset range will not affect the normal tensioning of the synchronous belt 32. The main control board compares the calculated displacement with the preset range. When it exceeds the preset range, the first driving member 13 is controlled to work to drive the moving wheel 12 to move in the first direction. The present application uses the sensing member 16 to sense the tightness of the synchronous belt 32 in real time, and automatically adjusts the tension of the synchronous belt 32 by driving the moving wheel 12 to move in the first direction, thereby achieving accurate and automatic adjustment of the tension of the synchronous belt 32.

[0057] For further information, please refer to Figure 4 , which is a structural schematic diagram of the moving block 14 in the synchronous belt tensioning mechanism provided in an embodiment of the present application. The moving kit 11 provided in the present application also includes a moving block 14 arranged between the moving wheel 12 and the first driving member 13. By setting the magnetic member 162 on the moving block, the magnetic member 162 can follow the moving wheel 12 to move in the first direction.

[0058] In a specific embodiment provided in the present application, the moving block 14 includes a first side wall 141 and a second side wall 142 that are relatively arranged, and a third side wall 143 for connecting the first side wall 141 and the second side wall 142. The present application rotatably connects the moving wheel 12 between the first side wall 141 and the second side wall 142, and connects the third side wall 143 to the driving shaft 131 of the first driving member 13, so that the moving block 14 is moved in the first direction relative to the driving wheel 31 under the action of the first driving member 13.

[0059] It can be understood that the first driving member 13 provided in the present application can be implemented based on a pushing or pulling structure such as an electric cylinder, a screw drive, etc., or can be implemented based on a telescopic structure such as a telescopic rod, or can also be implemented through a mechanical arm, a transmission shaft and other structures. As long as it can drive the moving block 14 to move in the first direction under the action of the main control board, any structure selected is feasible, and the present application does not impose further restrictions on this.

[0060] In a specific embodiment provided in the present application, the above-mentioned first driving member 13 is preferably configured in the form of a closed-loop motor. Since the closed-loop motor has a built-in feedback loop, the main control board is allowed to adjust the output signal according to the performance of the closed-loop motor under actual working conditions to achieve higher control accuracy, stability and faster response speed.

[0061] Furthermore, the present application sets the moving wheel 12 between the first side wall 141 and the second side wall 142, and rotatably connects the upper and lower ends of the moving wheel 12 to the first side wall 141 and the second side wall 142 respectively through bearings 15. At this time, the synchronous belt 32 is wound around a part of the wheel surface of the driving wheel 31 through the moving wheel 12. By rotatably setting the moving wheel 12 on the moving block 14, direct contact between the first driving member 13 and the moving wheel 12 is avoided, which affects the normal transmission of the synchronous belt 32 on the moving wheel 12 and prevents wear of the synchronous belt 32.

[0062] The above is the automatic adjustment method of the synchronous belt 32 achieved by the mobile kit 11 and the sensor 16 of the present application. As an optional implementation, the present application also provides a second tensioning assembly 20 that can assist in adjustment when the automatic adjustment fails. The second tensioning assembly 20 can be understood as a manual adjustment method of the synchronous belt 32 corresponding to the automatic adjustment of the synchronous belt 32.

[0063] In an embodiment of the present application, the second tensioning assembly 20 includes a fastening wheel 21 and a fastening block 22. The fastening wheel 21 is rotatably connected to the fastening block 22, and the fastening wheel 22 can move in a second direction relative to the driving wheel 31. In the present application, the synchronous belt 32 used in the 3D printing process is wound around the fastening wheel 21 via the driving wheel 31 and then extended along the second direction. The fastening wheel 21 is driven to move in the second direction by pushing the fastening block 22 to assist in adjusting the tension of the synchronous belt 32.

[0064] The present application is provided with a mobile kit 11, a sensor 16 and a main control board to realize automatic adjustment of the synchronous belt 32. At the same time, a second tensioning assembly 20 is provided to further drive the fastening wheel 21 to move in the second direction by adjusting the fastening block 22, so that when the automatic adjustment fails, the synchronous belt 32 is manually adjusted.

[0065] Based on the above-mentioned synchronous belt tensioning mechanism, the present application also provides a 3D printer, which includes a frame 1, a molding platform 2, a printing head 3 mounted above the molding platform 2, a driving component 30 for driving the above-mentioned printing head 3 to move, and the above-mentioned synchronous belt tensioning mechanism.

[0066] In the embodiment of the present application, the driving component 30 includes the above-mentioned driving wheel 31, and a synchronous belt 32 is wound around the driving wheel 31. In actual application, the number of synchronous belt tensioning mechanisms set should be greater than or equal to the number of synchronous belts 32 set. In principle, each synchronous belt 32 needs to be equipped with a corresponding synchronous belt tensioning mechanism to adjust the tightness to avoid insufficient number of synchronous belt tensioning mechanisms, which may lead to problems with the tensioning degree of the synchronous belt 32, affecting the movement of the print head 3 and the final printing effect.

[0067] Please refer to Figure 5 , which is a specific embodiment diagram of the synchronous belt tensioning mechanism provided in the embodiment of the present application, it can be observed that the present application is provided with two synchronous belts 32 along the third direction, and two synchronous belt tensioning mechanisms are provided corresponding to the two synchronous belts, and the two synchronous belt tensioning mechanisms are adjacently arranged on the frame 1.

[0068] Furthermore, the present application provides a mounting bracket 40 in the frame 1 for accommodating the above-mentioned synchronous belt tensioning mechanism, and the mounting bracket 40 includes a first mounting portion 41 and a second mounting portion 42. The present application sets the first tensioning assembly 10 in the first mounting portion 41 and sets the second tensioning assembly 20 in the second mounting portion 42.

[0069] In a specific embodiment provided in the present application, the first mounting portion 41 is extended along a first direction to cooperate with the movement of the moving wheel 12 in the first direction, and the second mounting portion 42 is extended along a third direction. However, in actual applications, the second mounting portion 42 is installed at a corner of the frame 1, and the second tensioning assembly 20 is arranged in the second mounting portion 42, and is installed on the same horizontal plane relative to the first tensioning assembly 10 to cooperate with the tightness adjustment of the synchronous belt 32 in the horizontal direction.

[0070] Furthermore, it can be observed that the present application also provides a connecting wheel 43 at the extension position of the mounting bracket 40 in the third direction, and the connecting wheel 43 is rotatably connected to the inside of the mounting bracket 40, and the connecting wheel 43 rotates around the third direction as the axis. When multiple synchronous belt tensioning mechanisms are used at the same time, the synchronous belt 32 used in the 3D printing process can be wound from one of the synchronous belt tensioning mechanisms to another synchronous belt tensioning mechanism via the connecting wheel 43.

[0071] As an optional embodiment, in order to cooperate with the second tensioning assembly 20 to realize manual tensioning of the synchronous belt 32, please continue to refer to Figure 3 In the present application, an adjustment hole 421 is opened at the position of the second mounting portion 43 corresponding to the fastening block 22. After passing through the above-mentioned adjustment hole 421, it abuts against the fastening block 22 to push the fastening wheel 22 to move in the second direction, thereby realizing manual tensioning of the synchronous belt 32.

[0072] Specifically, as long as a structure compatible with the above-mentioned adjustment hole 421 can pass through the adjustment hole 421 and push the fastening block 22 to move in the second direction, it is feasible. The present application does not further limit the specific setting form of the adjustment hole 421.

[0073] When the first tensioning assembly 10 and the second tensioning assembly 20 are installed on the mounting bracket 40, the driving wheel 31 can be directly installed on the mounting bracket 40 by rotating the rotating shaft, or a corresponding driving motor can be arranged under the driving wheel 31, and the output shaft of the driving motor is set through the mounting bracket 40, and the driving wheel 31 is sleeved on the output shaft of the driving motor. At this time, the driving wheel 31 can also rotate relative to the mounting bracket 40. Of course, the above setting methods of the driving wheel 31 are all feasible, and the present application does not impose any restrictions on this.

[0074] Furthermore, the second tensioning assembly 20 is configured as a fastening wheel 21 and a fastening block 22 capable of moving along a second direction on the mounting bracket 40. As for how to realize automatic and manual adjustment of the synchronous belt 32 on the mounting bracket 40 through the first tensioning assembly 10 and the second tensioning assembly 20, reference can be made to the description of the synchronous belt tensioning mechanism in the above-mentioned application embodiment, which will not be elaborated at this time.

[0075] For further information, please refer to Figure 6 , is a structural schematic diagram of a 3D printer provided in an embodiment of the present application. The present application further provides a lifting assembly below the forming platform 2 for driving the forming platform 2 to move in a third direction. The lifting assembly includes a second driving member 50, a screw rod 51 drivingly connected to the second driving member 50, and a guide plate 52 for erecting the forming platform 2. The screw rod 51 is arranged to penetrate the guide plate 52 to drive the guide plate 52 and the forming platform 2 on the guide plate 52 to move in the third direction.

[0076] In a specific embodiment provided in this application, please refer to Figure 7 , is a structural schematic diagram of the second driving member 50 in the 3D printer provided in an embodiment of the present application. The number of the second driving member 50 and the screw rod 51 is configured to be two, and the two second driving members 50 are relatively arranged below the forming platform 2 to drive the forming platform 2 to move in the third direction.

[0077] As an optional embodiment, a synchronous belt (not shown in the figure) can also be set between the two second driving members 50. The synchronous belt 32 ensures that the second driving members 50 on both sides maintain a synchronous tensioned state to prevent the molding platform 2 from tilting and affecting the 3D printing effect. Similarly, a second tensioning component 20 that can assist in adjustment can be set at a position close to the second driving member 50, and an adjustment hole 421 is opened at the position of the frame 1 corresponding to the fastening block 22. The corresponding second tensioning component 20 is adjusted through the adjustment hole 421 to achieve synchronous tensioning between the two second driving members 50.

[0078] Please refer to Figure 5In the figure, a is the first direction, b is the second direction, and c is the third direction. It can be observed that the first direction a, the second direction b and the third direction c provided in the present application are directions perpendicular to each other. Taking the first direction as the left and right direction as an example, the second direction corresponds to the front and back direction, and the third direction is the up and down direction, and so on. The present application does not make further restrictions on the specific directions of the first direction, the second direction and the third direction.

[0079] For other details about the above-mentioned 3D printer implementing the above-mentioned technical solution, please refer to the description of the synchronous belt tensioning mechanism provided in the above-mentioned application embodiment, which will not be repeated here.

[0080] The synchronous belt tensioning mechanism and 3D printer provided in the embodiments of the present application are used to tension the synchronous belt on the driving wheel, and a sensing member is provided to detect the tension of the synchronous belt. The first driving member drives the movable wheel to move relative to the driving wheel to adjust the tension of the synchronous belt, and the tension of the synchronous belt is maintained within a suitable range, thereby achieving accurate and automatic adjustment of the tension of the synchronous belt, and avoiding customers from frequently manually adjusting the synchronous belt. A second tensioning component that can assist in adjusting the tension of the synchronous belt is provided, and the synchronous belt can be manually adjusted when the automatic adjustment fails, thereby avoiding the synchronous belt being too loose or too tight and affecting the printing effect, and effectively improving the quality of 3D printing.

[0081] It can be understood that the technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0082] The above embodiments are merely exemplary embodiments used to illustrate the principles of the present application, but the present application is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of the present application, and these modifications and improvements are also considered to be within the scope of protection of the present application.

Claims

1. A synchronous belt tensioning mechanism, used for tensioning a synchronous belt on a driving wheel, characterized in that: A first tensioning assembly is included, wherein the first tensioning assembly includes: A moving kit, the moving kit comprising a moving wheel and a first driving member connected to the moving wheel, the synchronous belt being wound between the driving wheel and the moving wheel; A sensing element, wherein the sensing element is configured to sense the tension of the synchronous belt; as well as, A main control board receives the signal of the sensing element and controls the first driving element to drive the moving wheel to move relative to the driving wheel, so as to adjust the tension of the synchronous belt.

2. The synchronous belt tensioning mechanism according to claim 1, characterized in that: The sensing element includes a Hall sensor and a magnetic element, and the magnetic element is configured to follow the moving wheel to move in a first direction; The Hall sensor is used to output a corresponding pulse signal according to the intensity of the magnetic field change of the magnetic component, and transmit the pulse signal to the main control board.

3. The synchronous belt tensioning mechanism according to claim 2, characterized in that: The main control board is used to receive the pulse signal transmitted by the Hall sensor, and determine the movement amount of the moving wheel in the first direction according to the pulse signal, so as to determine the tightness of the synchronous belt at the current moment; The main control board is also used to control the operation of the first driving member according to the tightness of the synchronous belt at the current moment, so that the first driving member drives the moving wheel to move to a preset position along the first direction.

4. The synchronous belt tensioning mechanism according to claim 2, characterized in that: The moving kit further includes a moving block disposed between the moving wheel and the first driving member, and the magnetic member is disposed on the moving block to follow the movement of the moving wheel relative to the driving wheel in a first direction.

5. The synchronous belt tensioning mechanism according to claim 4, characterized in that: The moving block comprises a first side wall and a second side wall which are arranged opposite to each other, and a third side wall for connecting the first side wall and the second side wall; The moving wheel is rotatably connected between the first side wall and the second side wall, the third side wall is connected to the driving shaft of the first driving member, and the moving block is driven by the first driving member to move the moving wheel along the first direction.

6. The synchronous belt tensioning mechanism according to claim 1, characterized in that: The synchronous belt tensioning mechanism further includes a second tensioning assembly, the second tensioning assembly includes a fastening wheel and a fastening block, the fastening wheel is rotatably connected to the fastening block and can move in a second direction relative to the driving wheel; The synchronous belt is wound around the fastening wheel via the driving wheel, and the fastening wheel is driven to move in the second direction by pushing the fastening block to assist in adjusting the tension of the synchronous belt.

7. A 3D printer, characterized in that: The 3D printer comprises a frame, a molding platform, a printing head mounted above the molding platform, a driving component for driving the printing head to move, and a synchronous belt tensioning mechanism as described in any one of claims 1 to 6; The driving assembly comprises a driving wheel, a synchronous belt is wound around the driving wheel, and the number of the synchronous belt tensioning mechanisms is greater than or equal to the number of the synchronous belts.

8. The 3D printer according to claim 7, characterized in that: The 3D printer is also provided with a mounting bracket for accommodating the synchronous belt tensioning mechanism; The mounting bracket includes a first mounting portion extending along a first direction, and the first tensioning assembly is disposed in the first mounting portion.

9. The 3D printer according to claim 8, characterized in that: The mounting bracket further includes a second mounting portion extending along a third direction, the second mounting portion is disposed at a corner of the frame, and the second tensioning assembly is disposed in the second mounting portion.

10. The 3D printer according to claim 9, characterized in that: An adjustment hole is formed at a position of the second mounting portion corresponding to the fastening block, and the second mounting portion abuts against the fastening block through the adjustment hole to push the fastening wheel to move in the second direction.

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